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Yamaha SR 125 Problems

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ApexZerk
L Plate Warrior



Joined: 08 Aug 2013
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PostPosted: 18:44 - 08 Aug 2013    Post subject: Yamaha SR 125 Problems Reply with quote
hi, i bought a second had 93 Yamaha SR 125 last month and it was fine and then i ran out of petrol completely and didnt know cause there is no petrol gauge, ever since then i have been getting starting problems and the engine just randomly cuts out every now and then. is there anything i can do to sort this problem out. Thanks for the advice in advance.

i cannot get it above 50 either

and also are these tubes supposed to be exposed and only connected at one end?
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-Matt-
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Joined: 28 Apr 2013
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PostPosted: 18:55 - 08 Aug 2013    Post subject: Reply with quote
Better off in the workshop forum probably.

How old is the battery - when did you last charge it.

Get a torch in the opening of the fuel tank and have a peer inside see if you can see anything in the bottom/floating about that might be causing blockages etc.

Think the hoses might be breather hoses [which should be open at one end] but i'm not sure.

Other than that best waiting for the more mechanically minded to come along Whistle
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ApexZerk
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Joined: 08 Aug 2013
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PostPosted: 18:59 - 08 Aug 2013    Post subject: Reply with quote
i dont know how old the battery is and dont know when it was last charged, im new to bikes and dont know much about then, dont even know where the battery is. how would i charge the battery.

also the bike back fires, is this bad?
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-Matt-
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PostPosted: 19:02 - 08 Aug 2013    Post subject: Reply with quote
Battery is probably under the seat somewhere, don't know the bike in question in much detail - although if its backfiring on top of the other problems it might not be that, but a good place to start if you have a suitable charger handy to rule it out.

Try the workshop forum you should get a bit more help in there
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ApexZerk
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Joined: 08 Aug 2013
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PostPosted: 19:06 - 08 Aug 2013    Post subject: Reply with quote
i looked in the tank and there is some dirt in it, how would i get it out?
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adam277
Spanner Monkey



Joined: 28 Jul 2012
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PostPosted: 19:41 - 08 Aug 2013    Post subject: Reply with quote
You could always remove the fuel line from the bottom of your tank and flush it out, although I'd recommend you get someone who knows what they are doing to do it. There are some fuel system cleaners and treatment you can stick in your petrol, although I don't know how successful they are.
That seems the best option for you though, considering your lack of experience.

https://www.ebay.co.uk/itm/Redex-Petrol-Fuel-System-Injector-Cleaner-250Ml-/110784880993?_trksid=p2054897.l4276
You can buy these from Tesco and Halfords quite cheap.


https://www.motorcyclespecs.co.za/Gallery%20%20A/Yamaha%20SR125%2082.jpg
If this is your bike the battery should be in one of the side panels under the seat.

This isn't a battery problem though.
From what you have described. You have a issue with not enough fuel getting into the engine. Which is causing the bike to cut out.
The best thing to do is get someone who knows what they are doing to check the fuel line and carb and if necessary clean them out.

The reason it cannot go above 50 is because its top speed is 55mph.
https://www.motorcyclenews.com/MCN/bikereviews/searchresults/Bike-Reviews/Yamaha/Yamaha-SR125-1991-2003/
Quote:
The Yamaha SR125 struggles to maintain its speed in 5th gear - any kind of headwind or incline will see you prodding 4th gear to keep it above 50mph. The SR125's engine is reliable, but it's so sluggish it's hard to believe Yamaha's claim that produces 12bhp.

As it is a old bike chances are it cant do 55 anymore, or it may be due to your size and weight.
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ApexZerk
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Joined: 08 Aug 2013
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PostPosted: 20:10 - 08 Aug 2013    Post subject: Reply with quote
thanks for all the info and help i really appreciate it. i will look at the redex and see how it works
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-Matt-
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PostPosted: 20:11 - 08 Aug 2013    Post subject: Reply with quote
IIRC the reddex is packaged for cars, so be careful if it advises 'pour this much for a full tank of fuel' as its probably going by a full 50 odd litre tank on a car, so your little bike tank will be like a flood of reddex if you pour that much in Laughing
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ApexZerk
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PostPosted: 20:16 - 08 Aug 2013    Post subject: Reply with quote
my granddad used to be a mechanic so i will ride it to his and see if he knows anything about it and ask him about the redex
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ApexZerk
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PostPosted: 20:25 - 08 Aug 2013    Post subject: Reply with quote
MC wrote:
SR's are slow (even compared to a CG). Those tubes look like the carb overflow, & err... something else =)

are they supposed to be only connected on one end and one of them smells like petrol
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-Matt-
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PostPosted: 20:32 - 08 Aug 2013    Post subject: Reply with quote
Yeah, they're to allow excess fuel out/air in IIRC
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swampy
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Joined: 04 Aug 2004
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PostPosted: 20:42 - 08 Aug 2013    Post subject: Reply with quote
ApexZerk wrote:
my granddad used to be a mechanic so i will ride it to his and see if he knows anything about it and ask him about the redex


Ask him to take the carb off and give it a clean. Likely to be much more effective than using redex...

You've almost certainly sucked some of the shit from the bottom of your tank through your carb, and Redex aint gonna move that.

If your gramps was a mechanic, it shouldn't take him longer than half an hour. He could show you how to do it too, and you will be on your way to doing your own maintenance.
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Cheerfulgrin
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Joined: 17 Apr 2011
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PostPosted: 20:25 - 10 Aug 2013    Post subject: Reply with quote
I agree with Swampy, sounds like some crap from the tank has got in the carbs and is causing blockages, probably best to let someone who knows a bit strip and clean it out.

get an inline fuel filer too so its less likely to happen again if you run out.

the two pipes look like overflow or breather pipes to me but I'm no expert lol
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